Oh? That's very strange, it instantly works in private browsing mode, taking me to what looks like a desktop. I tried it again in non-private browsing mode and

Oh? That's very strange, it instantly works in private browsing mode, taking me to what looks like a desktop. I tried it again in non-private browsing mode and I still get the login window. Edit: deleting cache and offline website data in Firefox fixed it. In my experience when this fixes something it's usually because there's a broken web worker and that forces it to redownload.